Model 8323 - RS-232 to RS-422 Optically Isolated Interface Converter DIN Rail Mounted
Reference Manual


Table of Contents

1.0 Description
2.0 Operating Mode
3.0 Connection / Cabling
4.0 Switch Settings
5.0 Specifications
6.0 Help
Warranty



1.0 Description

The Model 8323 RS-232 to RS-422 interface converter allows information exchange in full-duplex mode over two twisted pairs, linking RS-422 equipment with asynchronous RS-232 equipment, on the DIN rail mounting system.
The RS-422 standard specified by the Electronic Industries Association (EIA) relates to the electrical characteristics of the generators and receivers used in a point-to-point system with symmetrical or balanced digital signals. The RS-422 interface is widespread in industrial environments.


The Model 8323 has one RS-232 I/O configured in DCE mode enabling the reception of data on the receive pair (RS-422 side) or the transmission of data towards the RS-422 transmit pair. The RS-422 4-wire connection allows full-duplex transmission.

2.0 Operating Mode

2-1 Block Diagram:


The Model 8323 interface converter provides opto isolation between the RS-232 interface and the RS-422 line by the use of optical couplers. The transmit data from the RS-232 port is sent over the RS-422 line where it is received by the far end RS-422 receiver.

2-2 RS-422 4-Wire Connection

The principle of an RS-422 4-wire link is based upon the use of independent transmission and reception circuits. Each link requires a termination load on the receiving end. Each Model 8323 located at the end of the link allows the insertion of this 120 Ohm termination (RS-422 Standard).

NOTE: The Model 8323 requires the use of twisted pair cabling with a nominal impedance of 120 Ohms. The use of cable that does not have the correct impedance or is poorly twisted will produce unreliable operation.

3.0 Connection / Cabling

3-1 RS-232 I/O (DCE mode)


3-2 4-Wire RS-422 I/O



3-3 DIN rail mounting of Model 8323

Top View :


Front View :


4.0 Switch Settings

Dip Switches

The Model 8323 incorporates a group of dip switches. Many of these settings are fixed in position and marked mandatory and should not be changed. Other switches that are user selectable are appropriately marked by an X.

4-1 Dip-Switch S1 :


01 : Mandatory
01 : Mandatory
001 : Mandatory
0 :
1 :
Common not connected to Earth by 100 Ohms
Common connected to Earth by 100 Ohms

4-2 Dip-Switch S2 :


0 :
1 :
Load Mid-point not connected to Signal Ground
Load Mid-point connected to Signal Ground
10 : Mandatory
0 :
1 :
No PULL-UP on Receive -
PULL-UP on Receive - in multipoint
0 :
1 :
No PULL-DOWN on Receive +
PULL-DOWN on Receive + in multipoint
00 :
11 :
Terminal Loads not connected
Terminal Loads connected
0 :
1 :
Common not connected to Loads
Load Mid-point towards common

4-3 Dip-Switch S3

Dip switch S3 settings are in mandatory position for FDX operation mode : 00000100.

4-4 Switches and Their Functions


4-5 Factory Settings : Master Mode (dark areas show switch position)




5.0 Specifications

Interfaces : RS-232 (V.24) and 4-wire RS-422 (EIA)/V28 (CCITT)
Transmission mode : Serial Asynchronous, FDX
Transmission speed : Transparent to 115.2 KBPS
Transmission Code : Transparent
Isolation : Via Opto-Couplers
Power : 115 Vac, 60 Hz standard, 230 Vac, 50 Hz optional
Consumption : 2.5 W Maximum
Dimensions : 3.1" x 1.57" x 3.35" (79 x 40 x 85mm)
Environment : Operating Temperature 0 to 50C, Storage Temperature -20 to 70C, Humidity 10% to 90% No condensation
Approvals : CE marked

6.0 Help

If any assistance is required please visit our  Technical Support Center.
 

Warranty

Telebyte warrants the equipment to be free from defects in material and workmanship, under normal and proper use and in its unmodified condition, for 12 months, starting on the date it is delivered for use. TELEBYTE's sole obligation under this warranty shall be to furnish parts and labor for the repair or replacement of products found by TELEBYTE to be defective in material or workmanship during the warranty period. Warranty repairs will be performed at the point of manufacture. Equipment approved for return for warranty service shall be returned F.O.B. TELEBYTE factory and will be redelivered by TELEBYTE freight prepaid, except for non- continental U.S.A. locations. These deliveries will be sent COD freight and import/export charges.

THE ABOVE WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, STATUTORY OR OTHERWISE, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TELEBYTE SHALL NOT BE LIABLE FOR ANY DAMAGES SUSTAINED BY RESELLER OR ANY OTHER PARTY ARISING FROM OR RELATING TO ANY EQUIPMENT FAILURE, INCLUDING, BUT NOT LIMITED TO CONSEQUENTIAL DAMAGES NOR SHALL TELEBYTE HAVE ANY LIABILITY FOR DELAYS IN REPLACEMENT OR REPAIR OF EQUIPMENT.

Out of warranty equipment may be returned to the Greenlawn, NY customer service facility prepaid as described above. Return shipping charges will be billed to the customer. The repaired unit will have a 90 day warranty. In those cases where "NO TROUBLE" is found, a reduced charge will be billed to cover handling, testing and packaging.

Whether in or out of warranty a Return Material Authorization number (RMA) is necessary
and can be obtained by visiting our Technical Support Center. Reference RMA number on the outside container.

Document No. 0315-0257/Rev. B

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